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Yes, oxygen is available almost everywhere (but I won't mention all the sources that provide it). And once you're trained and experienced enough, one of your dive mates will tell you how and where. You can carry your tank empty on most airlines.
I hate to tell you but there is not difference between the "grades" of oxygen, they all come off the same tower. The difference is the way the flask is filled, the rules say that medical grade has a vacuum pulled first. Most outlets pull a vacuum on all fills for safety sake.
Great idea, It would be interesting to see it go further! Also, to use 100% O2, all gear would also need to be Oxygen clean, something the consumer would probably have a difficult time getting done, if they knew it had to be done at all.
Keep up the good work!
It is amazing how much misinformation there is about oxygen. I believed that crap too, until I actually went out and investigated it when I was a University Diving Safety Officer and actually had to be responsible for the effects of my pronouncements.